HP (Hewlett-Packard) E6380-90019 Cell Phone Accessories User Manual


 
189
Connectors
EVEN SECOND SYNC IN EXT SCOPE TRIG IN
EVEN SECOND SYNC IN
This port is an input for the even second clock from the base station
under test. A positive edge on this connector starts two timers. One
timer, after reaching terminal counts, starts CDMA frame clocks. The
other timer starts pilot PN sequence generation. The Even Sec In
field on the CDMA GENERATOR screen controls this port. See the
"Even Sec In" field on page 100.
EXT REF IN
This connector allows you to input an external reference. The reference
frequency is selected using the Ext Ref In file on the INSTRUMENT
CONFIGURE screen.
Operating Considerations
When a valid signal is applied to the EXT REF IN port, the Test Set
automatically switches from internal to external reference if the Ref
Select field is set to Auto
.
This signal is used as a reference for, and directly affects, these
functions:
RF Generator Frequency (including the Tracking Generator)
RF Frequency Counter
AF Frequency Counter
RF Analyzer Tune Frequency
Spectrum Analyzer Center Frequency
AF generators 1 and 2 are not affected using an external reference; they
use their own reference.
NOTE The reference output frequency is always 10 MHz,
independent of the selected input reference frequency.
Electrostatic discharges to the EXT REF IN port of 0.5 kV
or above may cause degradation of performance requiring
operator intervention.
EXT SCOPE TRIG IN
This connector provides an external oscilloscope’s trigger input.
Operating Considerations
When measured with no load on the input, a 5 Volt level is present on
the connector due to the internal pull-up resistor design.
Main Menu